ML19337A856
| ML19337A856 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/25/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NCR-SQN-SWP-80, NUDOCS 8009300467 | |
| Download: ML19337A856 (2) | |
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400 Chestnut Street Tower II Septemoer 25, 1980 Mr. James P. 0*Rei j, Director Offico of Inspec en and Enforcement U.S. Nuclear R latory Cocucission Region II
" ite 3100 101 Mariett Street Atlanta, eorgia 30303
Dear Mr. O'Rollly:
SECUOYAH NUCLEAR PLANT UNIT 2 - SEISMIC QUALIFICATION OF THE AUXILIARY FEEDWAIER PUMP RECIRCULATION LINE - NCR SCN SW 8014 - FINAL RSPCOT The subject deficiency was initially reported to NRC-0IE Inspector M. Thomas on August 27, 1980, in accordance with 10 CFR 50.55(e).
Cr. closed js cur final report.
If you have any questions, please get in touch with D. L. Lambert at PIS 857-2581.
Very truly yours, IEGNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety l
Enclosure j
cc:
It. Victor Stello, Director (Enclosure) V Office of Inspection and Enforcement U.S. Nuclear Regulatory Cocacission Wannington, DC 20555 30/f 5
/I 8009300467-
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l ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 2 SEISMIC QUALIFICATION OF THE AUXILIARY FEEDWATER PUMP RECIRCULATION LINE NCR SQN SWP 8014 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency The 2-1/2 inch auxiliary feedwater pump recirulation line supports were desigred to the Class G requirements (deadload supports only) when they should have been designed to Class C (Seismic Category 1).
This problem was discovered during the review of supports required by IE Bulletin 79-14.
This recirculation line is common to both units and is used by the auxiliary feedwater pumps to carry recirculation water back to the con-densate storage tanks.
Safety Implication A break in the auxiliary feedwater pump recirculation line would not prevent the auxiliary feedwater system from performing properly. The safety concern is that other safety-related equipment in the luxiliary Building may be damaged during a seismic event by spray from a pipe break or the pipe itself falling on safety-related equipment.
Corrective Action The auxiliary feedwater pump recirculation line is being rigorously analyzed as a Class C line. Supports will be added as necessary to qualify the line as Seismic Category 1.
This will be completed before fuel loading of unit 2.
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